emerge/portage question (KDE 3.1 beta2)

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When I:
# cd /usr/portage/kde-base/kde/
# emerge kde-3.1-beta2.ebuild

I get the following message:
	emerge:  all ebuilds that could satisfy "~kde-base/kdeadmin-3.1_beta2" (from 
ebuild / kde-base/kde-3.1_beta2 merge) have been masked.

(kde-3.1-beta2.ebuild exists in that directory)

Any idea what I am doing wrong?
Am I misconfigured?  Or is the package broken?
(I get a similar error for beta1, but it is kdegraphics that it complains 
about).

Portage:	2.0.40
Kernel:	2.4.19
(Gentoo: 1.4? ... 1.4r2, if I remember correctly ... not sure how to find out 
after the fact ;)

Thanks in advance for any advice!

David
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